Got a set of HP heads, 2.02-1.60 valves but they have the earlier 86 manifold bolt patterns and wondered for now if I can get an adapter to use TBI?

 

I believe you can elongate the four center bolt holes on the intake manifold and it should fit with no problem.

Steve

 

Yes this is all you have to do to the intake but there is more. Is this going on a 1987 or later car. If so you need to make some changes to your valvetrain because those heads do not implement self alligning rockers. There are a few things that need to be drilled and changed but a search will give you the details on that. You also have to use perimeter bolt valve covers. Are these heads going on a 305? If they are you will have serious shrouding issues because of the size of those valves and you may actually lose power.

 

This is a strong running 93 4 bolt main 350, new HYP pistons and will use a .015-.018 Head gasket to get 67 cc even down more as around 64 cc, specs below: Heads are Pro Topline Torker's, chip was made for this but needed a least 9.0:1 compression, Never stock, should have bolt type of valve cover bolt holes-as World does and ad said should: (These are to replace wrong SR 76 cc heads sold to me as Torker 67 cc awhile back as I had a good set of stock 76 cc already-167-170 Runners!) Heads are a Pro Topline 2236720167-T and took forever to get right heads with right chambers as sold SR as these first, then got hurt/ill. Not sure how much I can push Compression on street motor as 67 cc heads and gasket can effect this say going from stock .041 to a .015-.020 should be helpful and any ideas welcomed and encouraged!

STL-H345NP40
Specifications:
* Bore: 4.040 in.
* Stroke: 3.480 in.
* Rod length: 5.700 in.
* Compression ratio: 10.01:1 (58cc heads), 9.39:1 (64cc heads), 9.02:1 (68cc heads), 8.68:1 (72cc heads), 8.37:1 (76cc heads),
* Head type: Flattop with 4 valve reliefs
* Oversize: .040 in.
* Ring size: 5/64 in. top ring, 5/64 in. second ring, 3/16 in. oil control ring
* Weight: 595 grams

I had gotten sold wrong heads and it was take these or nothing and I wanted the smaller chambers:

Here are the heads drilled for my manifold and what I thought I had gotten. One takes what one can get at this point:

http://www.smedingperformance.com/en...uck_engine.htm