I have a stock 350 with 882 heads 76cc[approx 8.5 comp] i have a set of 80-85 305 416 heads with 58 cc. If i install these heads i will have approx 10.3 comp.The 416 heads have 1.84 x 1.5 valves.What is a good cam to use with this application.I wont run the motor over 5 grand,its a daily driver 40 chev truck.[in the summer] & what thickness head gasket should i use.What timeing should i run.all help appreciated :?:
stk 350 & 305 heads
- Thread starter red40chev
- Start date
red40chev said:
All choices are a compromise and a balancing act between the components, given the limited info,the average sbc block that has not been deck machined will have a deck height of between about .020 and .023, so a head gasket in the .021-.024 thickness range will be about correct, for quench, and reducing detonation, the cam selected will be best selected with more detailed info, (read the links below) If the rear gearing and transmission is known, and you'll try to get about a 7.6:1- 8:1 dcr, for operating with pump gas, but in most cases a cam similar to the crane 114132 will provide good results, when your dealing with that rpm band and limited to small port heads
http://www.cranecams.com/?show=browsePa ... vl=2&prt=5
http://www.summitracing.com/parts/tfs-3 ... /overview/
http://www.summitracing.com/parts/tfs-3 ... structions
you are aware theres reasonably priced aluminum heads designed for a small bore sbc that out flow standard vortec heads
HOWEVER, the 882 heads will be the better choice in this case in this application,as the 416 heads with a 10.3:1 cpr will require a cam with more duration, to bleed off low rpm compression,and a tendency to get into detonation, than the intended rpm band your looking to operate in and that crane cams designed for,and youll tend to run into detonation issues in most cases with those 416 heads
youll want to degree it in at split overlap to reduce the dynamic compression ratio, and without knowing the transmission and rear gear ratio thats only a rough guess, based on several past similar builds. your cam selection could easily change, if I had more detailed info.
BECAUSE with a 10.3:1 cpr that cam will produce a higher than ideal 8.8:1 dcr even when retarded several degrees, while the same cam with the 882 heads installed dot-to-dot (4 degrees advanced) will have about a 7.6:1 dcr which while a bit lower than optimum is not bad for a daily driver, and will allow you to run regular octane fuel
ignition timing will generally be in the 35-37 degree total all in at 3200rpm range with about 8 degrees at 750-800rpm idle, in an ideal world youll run an overdrive transmission, like a 700r4 or 200r4 and have a rear gear ratio in the 3.07:1-3.54:1 range
viewtopic.php?f=52&t=727
http://www.hioutput.com/tech/343hp/343hp.html
(follow this build and use much of what can be used as its designed to maximize restrictive heads)
viewtopic.php?f=52&t=1070
viewtopic.php?f=52&t=82