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DukeD
Mike Duncan
Olive Branch, MS
(5 posts)

Registered:
09/30/2015 08:48PM

Main British Car:
73 MGB, 77 MGB V8 Ford 302

302 conversion aluminum head upgrade advice
Posted by: DukeD
Date: May 24, 2016 09:07AM

I had planned on running my stock 302 with the Edelbrock Performer intake and 600 cfm Holley for a
while before making any upgrades but I came across one of those "too good to pass up deals". I found
a set of AFR 185 heads, 60cc chambers, Crane roller rockers, Bullet hydraulic roller cam and lifters, pushrods,
and an Edelbrock RPM intake. And, everything is ligit as is the price. The guy is upgrading his 347. The parts
have about 2500 miles on them. I understand the 185 vs 165 issues with the lift and piston clearance. I know
some people are fly cutting the pistons and some have suggested a thicker head gasket, which I am not fond
of. I was thinking of using the stock cam since I would have to tear down the engine to replace the cam bearings. I was planning on eventually rebuilding the engine later when the budget gets better. I really don't want to put in another cam without changing the bearings. I will do the clay/playdough test to insure piston to valve clearance. I think the RPM is about an inch taller than the Performer so if it doesn't fit under the bonnet I will stay with the Performer.
So I'm looking for some words of wisdom. I have always trusted the advice and knowledge from you guys. Any advice will be greatly appreciated.
Cam specs. - Duration @.050 Int 234 Exh 240
Lift-Int .565 Exh .565


mgb260
Jim Nichols
Sequim,WA
(2019 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 302 conversion aluminum head upgrade advice
Posted by: mgb260
Date: May 24, 2016 04:03PM

I'd see if you can just get the heads. The cam is too much for the street. You would be much happier with the duration around 220@ .050 and lift around . 500. Plenty of performance and no valve clearance issues. The RPM is okay but the height and more top end performance isn't really necessary.


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

Registered:
07/21/2008 03:32PM

Main British Car:
1980 Triumph TR8 3.5L Rover V8

Re: 302 conversion aluminum head upgrade advice
Posted by: Dan Jones
Date: May 24, 2016 04:45PM

> I was thinking of using the stock cam since I would have to tear down the engine to replace the cam bearings

Do you know the cam bearings need replacing? When I pulled the 5.0L HO engine for inspection at 163,000 miles, the cam bearings were still on the tight side of spec. That engine has 240,000 miles now with those same cam bearings and still holds great oil pressure.

> Cam specs. - Duration @.050 Int 234 Exh 240
> Lift-Int .565 Exh .565

What's the lobe separation angle on that cam? What cc's are the heads? Is your short block an HO or does it have cast pistons? That's a lot of duration for 9:1 or less compression ratio.

> Plenty of performance and no valve clearance issues.

The AFR 185 heads have 2.02" diameter valves which can have piston-to-valve issues with the stock pistons.

Dan Jones


DukeD
Mike Duncan
Olive Branch, MS
(5 posts)

Registered:
09/30/2015 08:48PM

Main British Car:
73 MGB, 77 MGB V8 Ford 302

Re: 302 conversion aluminum head upgrade advice
Posted by: DukeD
Date: May 24, 2016 05:01PM

Dan,
The lobe separation is 108 according to the seller. The AFR 185 chamber is 60cc.
I saw the engine running before I bought it. Pressure was good and everything seemed tight.
It had 60,000 miles on a rebuild so I'm not sure the total miles. The guy says all was original.
Yes I'm concerned about the valve clearance. I may purchase everything and hold on to it for
a future rebuild. It's more power than I'll ever need in the little B but "just because". Now I'll have
to work on building the Dana 44 rear end. I was holding off on that too. Boys and their toys.
I just hope I can get everything back together and running before father time catches up with me.
Jim,
I just got your post on the other forum.
Thanks


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