Thread: Surprise under the hood

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Have you measured the stroke????? 1968 Camaro was available with 350 which would of had 4.000 bore and main bearing bore in block 2.6406/2.6415
1968 327 would also be 4.000 bore and same main size------------

Jerry
I have not measured but the machinist tells me that it is a 327 crank. It is a LJ 4 bolt main. I have read that in 68 and 69 GM built 4 bolt main blocks that were all 4.00 bore that accepted 302, 327, and 350 cranks. I guess if that is true, GM did produce factory 4 bolt 327's. I am past caring about weather they did or didn't. I am building on a budget and want to invest in heads and roller cam. I had planned to use my .030 pistons. Now I need to purchase .040 pistons and although I appreciate all of the expert information and recommendations posted by Tech1, I can't afford $246.00 per each. I will not sacrifice dependability for cheap so if there is not an economical alternative in a flat top piston, then I will wait to do the build. Can anybody recommend an alternative? What is the diff between cast, forged, and hyper?

Hi scrpirn56, You are reading the Summit add wrong. The price is $246 for a set of 8 not each. Does that help? As for strength in pistons, Cast is standard and used in a lot of engines, Hyper is a stage stronger - some higher horsepower stock engines use these now and are considered good street engines, Forged are the strongest of all, used for racing and serious horsepower engines. The difference in strength of the types of pistons is due to the method of manufacture and the resulting grain structure. Following the suggestion of Tech, he is suggesting a strong piston, that will not fail you, at a reasonable price.
Tech Inspector, I have a 327 in the 40 and am highly interested in your estimate of the horsepower following your suggested build. Any guesses? Thanks

I agree with most everything said though not a Chevy man I do have a couple comments on exhaust that for ME made a difference. Please listen to Tech I've learned the hard way.The X pipe is superior to H pipe in my opinion . Long tube headers are great but in my71 Lincoln Mark iii,1976 Cordoba and 69 Ford LTD/Cobra they ALL dragged terribly. over every bump or incline. The shortys aren't as good as long tube headers nobody is debating that but they are better than manifolds to ME and MY CARS. Also I had my exhaust going all the way out the back l6ft out back that is. It was loud if you were out back but inside or on the side of car not the best. So I dumped two of them out the sides in front of rear tires and used side pipes on another. The underneath may not be good idea. I had my exhaust dumped right in back of front tires on my Lincoln and that did get on my nerves real quick. Just my opinion based on my experiences that's all.The breather to me is almost meaningless. I've run every kind of breather known to man on dyno means little to nothing. Proof of that. is when I went to a functional hoodscoop on my 1969 Ford I see no difference whats so ever.
I wouldn't get to caught up in the 4 bolt main debate. That ain't that big a deal anyway
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Can anyone say Brain Cramp? 1=8 Thanks.

Tech Inspector- I can't thank you enough for the advice/recommendation. I will post the results in a month or so.

Hi Mike.. I see both you're earlier post and later post.. I think the computers are playing games with you! Trick or treat???

Welcome aboard!