Clutch question
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5th Wheeling
Joined: Nov 2019
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Clutch question
Ok experts... Finally getting the 400 block back from the machine shop and getting giddy about putting this thing back together. 400 block bored .060 over (didnt want to go that much but had to), trickflow power port heads (195 runners with 72CC chambers), howards rattler roller cam, forged cleveland style pistons with a 11.7cc dish milled in, 1.7 comp height. 10/10 crank. New CID=414. Edelbrock manifold and 600cfm eddy carb (for now). HEI conversion distributor. and some other goodies. Expecting somewhere in the neighborhood of 425hp at 9.86:1. Going in a 79 F250 4x4. Im guessing ill want something a bit stouter than an OEM clutch set up. Any GOOD suggestions?
Lead Driver
Joined: Mar 2004
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Any used block will more than likely need to be align honed, did the machinist check the align bore in the block ? Did you get it balanced ? Is this a solid cam ? Hydro cam ? Either way, valve train geometry is going to have to be gone through. Push rod length arrived at, cam degreed in, etc. If it's a solid your going to want to choke the oil down to the top end. Camshaft selection is critical, did you consult with Howards on your build or is it an off the shelf cam ?
IMO, all things considered, I wouldn't be too disappointed if doesn't make the 425.The main thing that is going to hold it back is the carb's size and the compression ratio. It should make tons of torque though and that's what a good running 400 is all about.
If you have a factory 400 flywheel it's for a 12" clutch and it's drilled for a Long style clutch. Remember it's cast, so I'm not so sure just how fast I'd want to turn one but any dyno room operator should have a good idea.
IMO, all things considered, I wouldn't be too disappointed if doesn't make the 425.The main thing that is going to hold it back is the carb's size and the compression ratio. It should make tons of torque though and that's what a good running 400 is all about.
If you have a factory 400 flywheel it's for a 12" clutch and it's drilled for a Long style clutch. Remember it's cast, so I'm not so sure just how fast I'd want to turn one but any dyno room operator should have a good idea.
Lead Driver
Joined: Oct 2018
Posts: 7,841
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A stock clutch can hold what you have but if you want an upgrade it's mostly about how much you want to spend. I like Centerforce but I wouldn't go with the dual friction on a pickup I'd use the II series. on my highboy with a 428 CJ I wanted to use the CFT II but they said I could have clearance issues with the cast iron bellhousing. so I used the RAM long style clutch and it seems to be a good clutch. I don't think the bellhousing you have limits you though.
There are lots of other options just don't get any extreme clutch you're not going to like them in a pickup.
There are lots of other options just don't get any extreme clutch you're not going to like them in a pickup.
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