327/300 rebuild.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,037
Likes: 36
From: The Corner of Moncks
St. Jude Donor '07
327/300 rebuild.
So I have the engine out of my '68 and have torn it down, the #7 piston came out in pieces, the block can be salvaged, it's at the machine shop now along with the crank. I'm going to have it bored .030" over and have the crank snout drilled and tapped for a harmonic balancer bolt.
I'd like to spice it up with a "151" cam, are any of you running this cam? What are other considerations in switching to this? Will it run with stock springs? Am I ok with the stock converter? Any insight would be helpful.
I'd like to spice it up with a "151" cam, are any of you running this cam? What are other considerations in switching to this? Will it run with stock springs? Am I ok with the stock converter? Any insight would be helpful.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,221
Likes: 9,359
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
stupid security losst my post....
If you can afford it, do it right while its out, it will only cost you the increaase from getting a valve jopb on your old crap heads to new aluminum ones for similar cast and the cam upgrade and springs.....you should up your compression with some flat top or domed pistons. invest in some decent heads to get your motor flowing so you can bump it up to 375 hp but instead of using that old cam go with new technology. the newer cams are going to get you much more HP with out all the overlap and lost vacuum. If it was my motor I would go with a cam around or better than .500 lift and over 250 duration and upgrade the heads to something like this if you are looking for a stock look...just paint them and they will look like the old camel back heads or double hump heads, whatever you called them as a kid
https://www.ebay.com/itm/26605399835...15a0145fbc7389
If you can afford it, do it right while its out, it will only cost you the increaase from getting a valve jopb on your old crap heads to new aluminum ones for similar cast and the cam upgrade and springs.....you should up your compression with some flat top or domed pistons. invest in some decent heads to get your motor flowing so you can bump it up to 375 hp but instead of using that old cam go with new technology. the newer cams are going to get you much more HP with out all the overlap and lost vacuum. If it was my motor I would go with a cam around or better than .500 lift and over 250 duration and upgrade the heads to something like this if you are looking for a stock look...just paint them and they will look like the old camel back heads or double hump heads, whatever you called them as a kid
https://www.ebay.com/itm/26605399835...15a0145fbc7389
- Visually similar to GM casting #3782461, which first appeared on the 1961 Corvette “fuelie”
- No accessory bolt holes, just like the original heads
- Heads are sold EACH and come bare (no springs, retainers, rocker studs)
- Aluminum heads shave 40 lbs. off the nose of your car vs. original 461 iron heads
- Improved port/chamber shape for better performance and efficiency
- Standard port location for use with most intake and exhaust manifolds
- 180cc intake port volume (factory 461 casting was 160cc)
- 62cc exhaust port volume (same as factory 461)
- 64cc fast-burn combustion chambers deliver big power gains vs. 461 castings
- Combustion chamber volume number was calculated using an Autolite 3934 spark plug
- Valve seats machined for 2.02” intake/1.60” exhaust valves (most 461 castings were 1.94/1.50)
- 3-angle valve job promotes better flow, especially at low-to-mid lifts
- Intake flows 232 CFM @ .500” lift, exhaust flows 173 CFM @ .500” lift
- Flow numbers were measured with a SAENZ 600 bench, 4.030 bore fixture, 1205-style intake fixture, and 28 inches of water
- Exhaust port gained 20 cfm above advertised number by adding a 1-5/8 pipe (header), a larger 1-7/8 pipe flowed the same
- Accepts both perimeter and center bolt valve covers
- 1.560” max spring pocket diameter gives you many valve spring options
- High nickel powdered metal valve seats provide optimum heat transfer and wear characteristics
- Manganese bronze valve guides reduce friction
- Valve guides are compatible with all common valve materials and fuels
- Accepts modern positive stop valve stem seals for better oil control
- Machined for 3/8” screw-in rocker arm studs and guide plates (not included)
- Blocked exhaust heat riser manifold crossover port
- 3/8-inch NPT coolant temperature probe port
- Designed for 1962-1986 small block engines (302/327/350)
- Heads will fit on a .030-inch or larger bored out 283 block (2.02/1.60 valves) when 350 head gaskets are used
- Consider our for cams under .550" lift
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
The car in my Avatar had the L-79 "151" cam in it and it is crazy how well it works.......I had a 1.6 rocker on it but be careful of pushrod clearance at the slot in the head......I also had heads that had about 80 of valve job and porting on them.......so it really like the cam.....
The L-82 cam is even better......has a little more vacuum......and a little more lift.......I feel it is a better alternative.....
If you build it with some compression (10.25-10.5 to 1) you can put a larger cam in it.......the Comp 280H Magnum is crazy good with some compression and a nice dual plane intake......good heads will make the cam work even better, and the 280H is a great sounding cam....
230/230 .480/.480 110LSA......lobe are lazy but not as lazy as the L-79 cam......
Jebby
The L-82 cam is even better......has a little more vacuum......and a little more lift.......I feel it is a better alternative.....
If you build it with some compression (10.25-10.5 to 1) you can put a larger cam in it.......the Comp 280H Magnum is crazy good with some compression and a nice dual plane intake......good heads will make the cam work even better, and the 280H is a great sounding cam....
230/230 .480/.480 110LSA......lobe are lazy but not as lazy as the L-79 cam......
Jebby
Drifting
Joined: Nov 2016
Posts: 1,964
Likes: 579
From: Pittsburgh PA
i would take a look at duke's "tale of two camshafts" you can get the torque of a 300 hp 327 with the top end of a L79
https://www.corvetteforum.com/forums...camshafts.html
https://www.corvetteforum.com/forums...camshafts.html
