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I have a 327 that needs to be rebuilt and would like to have 300 to 350 hp on a limited budget and use pump gas. Here is what I know;
1965 327
186 double hump heads
crane gold roller tip rockers
cam unknown
intake Edelbrock c3b
holley 750
What kind of pistons and compression and what cam would work for what I have?
Pat
20 VIEWS,NO REPLIES,,,well they must be watching football:rolleyes:
My 2cents,,,,,,,somebody,,,,I might as well start it,,,will want to know 'how much' you willing to spend on it cause you really ask a difficult question to answer with the info. you provide.
The HP your looking for would be very easy to obtain out of a 327,,,ME,,,,I'd check out pistons and cams on ebay(only new) and pattern it after a GM 327 design if it's a 'driver'. And "depending on what head combustion chamber size you have(cc's)" stay above 9.1:1 and match a cam to that CR and 350HP should be in reach and run good on pump gusoline:D
Don't know that GM produced one with CR that low and yet 300-350 HP,but it's easy to do.
If you wish to pattern it after the OEM GM set up, Faylur has a good call there. Crane and Comp and Isky and Lunati so on build the cam to achieve what you want. Mind you the profiles are slightly different for today's fuel but all in all, a better cam. Most will still require no less than 9.5:1 and really want to see 10:1 compression. Choose wisely when it comes to pistons and cam. You already have the heads to do the job. Look at other cams you might consider running. Other profiles are available that will accomplish the task and yet have a big difference in character as far as the way the thing runs and pulls through the power band.
186 casting number heads are supposed to have 2.02 and 1.6 valve with 64cc
A local speed shop recommend the following to achieve 350hp.
Pistons, flat top cast 9.75-1 comp.
Rings, plasma moly
Comp cams 12-250-3 cam kit 218/224 dur.
.507/.510 lift.
includes lifters,springs , retainers, seals, locks,
timing set
Comp Cams magnum rocker arm kit with pushrods
This engine is in a 1955 Chevy and has a muscie transmission. Also has headers.
I am an old fart who wants some performance for cruising and not for racing.
Do not know enough about engine to make a good choice and want some advice.
Pat
not bad....... OEM called for 10:1....2.02 heads(492,186,etc) cam was .447 both intake and exhaust. 306 adv duration. .222@050. LSA @114. this is just to give you a comparison of what GM built the thing with. Understand please that the big 3 would inflate what ever they had to compete with each other. You should be more than fine for HP ratings of what you wanted. This setup should give you some grunt.
They made plenty of stock 327 engines for 1965(I had one in my super sport) that put out 300HP and compression was 10.5:1.
the cam should work ok, dont use plasma moly rings erick will tell you why :D a good set of hastings power flex would work fine. on the other hand, try for 10:5-1 compression for some good power. with those ehads power will NOT be hard to acheive. a good intake for that would be the rpm air gap.