Save all the cam and valve train parts if this is a roller, the factory roller is way less expensive than aftermarket rollers. The block is more likely to be a four bolt given the 906 head’s but you need to check.
Edelbrock thumper cam 350 small block crack#
But you just want to spend the money to get them cleaned and crack inspected before chunking out hard earned cash on restoring them. Best roller cam for 350 with Vortec heads-Chevy 350 thumpr cam- COMP Cams 12-602-4. Boat engines while often used harder are also run cooler so those head’s usually last better. The best 350 small block camshaft can enhance your cars engine. I’ve found the 906 to be a bit meatier than the 062, but in heavy duty hard use of land vehicles that doesn’t seem the improve crack resistance much. A little mild throat clean up to blend port wall to the seat evens up the flow to that of the 062 head.
Typically the 906 drops about 10-12 CFM of flow on the exhaust side compared to the 062. It will bring up a post by Comp cams which has all of these cams idling on a dyno. If you want to hear all of these 'thumper' cams idling go to and type in 'thumpr cams'.
Edelbrock thumper cam 350 small block install#
Great link Tango I am going to install a 'mother thumper' camshaft in a small block chevy I am going to be building for my Graffiti coupe soon. The big difference in the 062 and 906 head is the 906 is usually found with pressed in exhaust seats instead of the induction hardened seat of the 062 head. Great article on the Street Rodder Website.
With a little detail part enhancement it’s easy to get 400 maybe 415 hp SAE gross and a similar amount of torque with a 350 under these 元1 Vortec heads. So compared to the old SAE gross power test this engine would pull 300 horse on an engine dyno with factory production parts. This engine is rated at 250 or 255 I forget exactly, however, this is the SAE net power rating which includes a working coolant pump and fan, the alternator is installed and turning but not charging, emissions equipment is installed and functional, production manifolds and a length of straight open head exhaust pipe of 8 or 10 feet I don’t remember off the top of my head. Since the camshaft and lifters are internal components, several external parts will need to be removed first in order to complete this task.
The roller cam times pretty close to that used in the pre-SMOG era 290/300 horse 350 which is a rating of SAE gross power that being tested without the engine turning the coolant pump or fan nor anyother accessories, with production manifolds but no exhaust system. Changing the camshaft on a small block Chevrolet 350 engine is a project that requires methodical disassembly, inspection and reassembly of many parts on the engine. So you need to peak at the block to see what you’ve got there. Marine fuel supplied to the engine wandered through some iterations that are different from land yachts in that the high pressure pump is not in the fuel tank rather in a separate small reservoir close to the engine that was fed by an engine driven mechanical pump. The cam that comes in these should be a roller, the motor vehicle and marine cams time the same but the marine should have a fuel pump lobe and the block should have finished mechanical fuel pump provisions, though this might be plated over. The only US production of this engine with TBI was on G30 vans and some marine engines not equipped with carburetors. Roller Lifter Install Kit for '87-'90 Blocks or '91-'02 Blocks can be purchased.906 head’s are the heavy duty head for trucks and vans. If your block has '87+ OEM-style roller cam provisions but does not have roller components fitted, COMP Hyd. Most '87 - '93 GM cars came with roller lifters, but most '87 - '95 trucks came with flat tappet lifters in roller lifter style blocks.
Please Call, Email, Twitter or Live Chat for details.Ģ: The '87+ Chevy Small Block received provisions for roller lifters.
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