question for grumpyvette?

[fastzcars]

Hi grumpy. I have a sbc with a engine suffix code of CC. Its a one piece rear main seal,4 bolt block with a cast crank. The heads on it have casting number 14011083 w/64cc chambers. My question will the heads flow enough for a larger cam? I was thinking along the lines of a Comp Cams Hydro Roller XR270HR? My second question is How can I check to see If I have enough Retainer clearence. Any help or suggestions would be greatly appreciated.Thanks.

[fastzcars]

Thank you Grumpy. You answered all my questions. Even ones I should have asked.I knew I came to the right place. Thanks Again.

[grumpyvette]

casting# 14011083...55-86...350..........Crate motor for years indicated.

285/300hp, 64cc chambers, 1.94"/1.5" valves

This cylinder head is a service head less valves and springs which is used on the 350 ci (300 hp) engine. This head is an excellent replacement for street use. It has 1.94" intake valves, 1.50" exhaust valves with 64cc chambers. They require late model center hold down valve covers.

Technical Notes: This cylinder head has 64cc chambers. The cast number for this head is P/N 14011083 or P/N 14096217. This head has the standard 1955-86 angle manifold attachment holes.

this is your low end crate motor iron head for center bolt valve covers and the old more common style intakes(before vortec style).while not top of the line it is not a bad street head and yes,THAT CAM WILL GET YOU ABOUT 25 MORE HP THAN THE STOCK CAM (if it fits valve clearance wise) BUT IF YOU WANT THAT ENGINE TO KICK A$$, BETTER HEADS WILL BE NECESSARY especially if you want over 425 hp.

 

you cam check your clearances by measureing the installed valve spring height (about 1.8") then the compressed height as the retainer hits the valve guide(use a light checking spring and a valve spring compressor)now subtract that from the other measurement and add .050 for minimum clearance to see what your max cam lift is)

 

example

 

spring measures 1.750" installed , less 1.225 compressed height when hitting valve guide=.525-.050 for clearance =.475 total lift space available (very common measurements) that would mean your .510 lift roller cam will require new springs, possiably new retainers and valve guide machine work to fit or the first time you run it the cam will wipe a lobe from binding valve train pressures. now the next thing is after the heads get fixed you need to check piston to valve clearances (not likely to be a problem but check anyway to be safe!!)

 

you can avoid some of this by buying better aftermarket heads (most come set up for at least a .540 minimum lift clearance, some are set up for as much as .700 lift) lets say the machine shop wants $200 for a 3 angle valve job,$250 to install bigger 2.02/1.6" valves and $80 for installing screw in rocker studs and $75 to clearance the valve guides and install new valve seals on your heads (COMMON PRICES)thats $600 in heads work and your still stuck with heads that flow less than 245cfm if you sell the heads you have for lets say $150 to someone who needs good repair heads and buy a set of 215cc iron eagle heads youll spend $740-the $150 you got for the old heads=$590 and gain about 45 more hp with the head change and they are already set up for a .540 lift and flow better than 270cfm look here

 

http://www.midwestmotorsportsinc.com/mms.nsf/pages/Specials