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mgb260
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Another 300 Stroker soon to hit the road
Posted by: mgb260
Date: August 07, 2024 01:00PM



mgb260
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Another 300 Stroker soon to hit the road
Posted by: mgb260
Date: August 07, 2024 01:16PM

You could also use this piston with bushed 350 rods in a 300 stroker with 350 crank:

[dssracing.com]


spridget
bill green
Maine
(74 posts)

Registered:
03/22/2008 01:29PM

Main British Car:
3 1980 TR8, 1 TR7 2 Bugeye Sprite 1 MG midget TR8 3.5 and 5.0, Sprite 1098 and ?

Re: Another 300 Stroker soon to hit the road
Posted by: spridget
Date: August 09, 2024 07:17AM

I also have a 300 stroker on the stand that's been waiting for the appropriate body. I found a disassembled TR8 with repaired front body damage. The body has come along nicely and is starting to go back together. I'm hoping to start real assembly soon.


mgb260
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Another 300 Stroker soon to hit the road
Posted by: mgb260
Date: August 09, 2024 10:16AM

Bill, what specs for your motor?


mgb260
Jim Nichols
Sequim,WA
(2482 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Another 300 Stroker soon to hit the road
Posted by: mgb260
Date: August 09, 2024 02:41PM

Another neat thing about the LS stroker pistons is you can get a 3.78 bore. Only .030 over. The 1.165 pin height will get around 9.5 compression and the 1.215 pin height will get around 10.5 with the 350 crank and rods in a 300 block.

[dssracing.com]



Edited 2 time(s). Last edit at 08/09/2024 03:01PM by mgb260.


ag1234
Arthur Gertz

(119 posts)

Registered:
03/29/2023 08:26PM

Main British Car:


Re: Another 300 Stroker soon to hit the road
Posted by: ag1234
Date: August 09, 2024 05:43PM

"350" rods, Buick or sbc ? Aren;t Buick 350 cast ? Grind down the mains to 2,500" ? Perhaps the Cad 4.9L. crank will prove to be less work ?
Art.


spridget
bill green
Maine
(74 posts)

Registered:
03/22/2008 01:29PM

Main British Car:
3 1980 TR8, 1 TR7 2 Bugeye Sprite 1 MG midget TR8 3.5 and 5.0, Sprite 1098 and ?

Re: Another 300 Stroker soon to hit the road
Posted by: spridget
Date: August 13, 2024 07:40AM

It is a Rover 4,0 block bored 60, 215 rods, ford 255 pistons, slightly worked 1964 Buick 300 heads with larger valves, roller rockers and a woody cam. That's what I remember without digging out the paperwork.



Dan Jones
Dan Jones
St. Louis, Missouri
(305 posts)

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: Dan Jones
Date: August 14, 2024 01:24PM

Bill, the 300 stroker that Jim mentions isn't a Rover/Buick aluminum block using a Buick 300 crankshaft. Instead it's an iron Buick 300 block using a Buick 350 crankshaft. If using the a 3.81" bore LS piston, the displacement is 351 cubic inches. Assuming you are using a Buick 300 crankshaft and 3.76" bore pistons, you'll be at 302 cubic inches.


spridget
bill green
Maine
(74 posts)

Registered:
03/22/2008 01:29PM

Main British Car:
3 1980 TR8, 1 TR7 2 Bugeye Sprite 1 MG midget TR8 3.5 and 5.0, Sprite 1098 and ?

Re: Another 300 Stroker soon to hit the road
Posted by: spridget
Date: August 16, 2024 07:31AM

Sorry, yes i failed to mention the Buick 300 crankshaft with a performer intake. It was built 10 years ago.
I also have a complete 64 Buick 300 in storage so the iron 300 build will be of interest.


Dan Jones
Dan Jones
St. Louis, Missouri
(305 posts)

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: Dan Jones
Date: August 17, 2024 10:05PM

I cleaned up a 1964 Buick 300 engine block today and popped it on the scale. With main caps and bolts, the clean standard bore comes in at 138 lbs. If I remember, I'll put a similar Buick 215 block and a Rover on the scale tomorrow.
Buick_300_block_138_lbs.JPG


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6507 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Another 300 Stroker soon to hit the road
Posted by: BlownMGB-V8
Date: August 18, 2024 08:12AM

Sounds about right. The 215 should be about 60 lbs, the 3.5 about the same. I suspect the late Rover will be a bit heavier.

Jim


Dan Jones
Dan Jones
St. Louis, Missouri
(305 posts)

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: Dan Jones
Date: August 19, 2024 03:05PM

I weighed the Buick 215 block at 68.5 lbs with main caps and bolts. That's for a clean bare block that was bored 0.030" over. Unlike the Buick 300, it does have the main and cam bearings installed, along with the block drains and the two small bolts for the oil pickup. The main caps and bolts accounted for approximately 10 lbs of the total.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6507 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Another 300 Stroker soon to hit the road
Posted by: BlownMGB-V8
Date: August 20, 2024 11:09AM

Interesting Dan. I shipped two or three 215 blocks out through the USPS and they had a 60 lb weight limit. That was including the caps and the cardboard box they shipped in. I was right at the limit with them, both according to my scales and the post office. Could there have been that much variation in the 215 blocks? I don't see how. Now if the one you weighed was a 3.5L Rover instead that would account for it.

Jim


Dan Jones
Dan Jones
St. Louis, Missouri
(305 posts)

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: Dan Jones
Date: August 21, 2024 11:24AM

Jim, it's a semi-die cast Buick 215 block with a smoother finish than the sand cast Rover block. Also, the starter hole is the smaller diameter 2.75" versus the Rover 2.875" and it is stamped with HI 96513 on the deck that indicates it is a 1962 high compression model equipped with a 4 barrel carburetor. I checked the weight on a digital scale which read a bit higher at 69.2 lbs. I checked the USPS site and it states "the maximum mailable weight of any mailpiece is 70 pounds."
Buick_215_block_beam_scale2.JPG
Buick_215_digital_scale_69_lbs_closeup.JPG


minorv8
Jukka Harkola

(271 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: minorv8
Date: August 22, 2024 12:17AM

For reference: I have a 4,6 Rover block laying around. It measures 35,9 kg which equals to 79,1 lbs. Bare top hat linered block with main caps and cam bearings. Casting dates to 1998.



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6507 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Another 300 Stroker soon to hit the road
Posted by: BlownMGB-V8
Date: August 22, 2024 10:55AM

Good reference info, thanks. If we knew the weight difference between the different heads that would also help.

I have a 340 block I can weigh, it is 2lbs heavier than a 300 block. I was thinking it was right at 140 but it seems my memory is beginning to develop a few holes so better to weigh it on the grain scale and be sure.

Jim


minorv8
Jukka Harkola

(271 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Another 300 Stroker soon to hit the road
Posted by: minorv8
Date: August 24, 2024 01:41AM

Rover head ERC0216 dated 1990 weighs 9,2 kg (20,3 lb). Head complete with valves and springs, less rocker gear.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6507 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Another 300 Stroker soon to hit the road
Posted by: BlownMGB-V8
Date: August 24, 2024 10:15AM

300 head in the same configuration is about 17 lbs.
Rover TA head, about 27 lbs.

Jim


Alfred
Clay Lambert

(2 posts)

Registered:
10/20/2024 11:09AM

Main British Car:


Re: Another 300 Stroker soon to hit the road
Posted by: Alfred
Date: November 07, 2024 03:20PM

In looking for Buick GS350 crankshaft specs, I stumbled onto this nicely detailed spec sheet for the small block buick 350 engine in 1970 (Last hurrah and arguable peak-power of the Muscle Car era)... so I thought I'd drop it in here. It even has minutia such as the 10 gallons-per-minute of the waterpump (at 1000 rpm).

[www.teambuick.com]

Crank specs are:

Crankshaft specifications:
Material Nodular iron
Bearings 5 replaceable steel backed
Bearing material #1, #2, #3, and #4 M/400 #5 M/100 Durex
Bearing taking thrust load


Connecting rod specifications:
Bearing length .737
Bearing clearance (Limits) .0020-.0023
End play- Total for both rods .006-.014

Crankshaft specifications:
End play at thrust bearing .003-.009
Main bearing journal diameter, 300 2.9995
Crank pin journal diameter 2.0000
Main bearing overall length
#1 .864
#2 .864
#3 1.057
#4 .864
#5 .864
Main bearing to journal clearance .0004-.0015


...and lots more.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6507 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Another 300 Stroker soon to hit the road
Posted by: BlownMGB-V8
Date: November 07, 2024 04:40PM

Don't know the source of that but if you use those rod bearing clearances you are likely to have oil pressure issues. Factory specs are about half that.

Jim


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