300 tempest upgrades?

Old 10-04-2019, 04:03 PM
  #1  
Registered
Platinum Member
Thread Starter
iTrader: (1)
 
Join Date: Jul 2007
Location: Lake George, NY
Posts: 375
Likes: 0
Received 0 Likes on 0 Posts
Default 300 tempest upgrades?

Whats everyones thoughts on building up a 300 tempest? They run a hotter cam than the 260's and correct me if I'm wrong but I believe they have a higher compression ratio too (9-1?). I've heard they have forged crank, forged rods, and forged pistons, anyone know if this is correct? If so this may be a nice candidate to upgrade due to the fully forged internals. How high of rpms can you safely spin this?
I think these were 300hp at the propshaft. Is it worth upgrading to roller cam and roller rockers? Maybe a call to Bob M. or just upgrading to a LT4 hot cam? How about a nice set of aluminum heads and intake too? With new heads and intake and cam, whats your thoughts on propshaft hp numbers?
Exhaust would be aluminum Gil small block manifolds with HP500 risers, the newer high rise type.
DjMikeyC is offline  
Old 10-04-2019, 04:46 PM
  #2  
Registered
 
Join Date: Jan 2009
Posts: 142
Likes: 0
Received 0 Likes on 0 Posts
Default

Dont know about the tempest specs but you dont need any fancy parts to get sbc to 350-400 flywheel hp range. If the compression is 9.0:1 you are in the sweet spot imo. Stock heads with good valve job and bowl porting, comp xm or xe262 flat tappet cam, edelbrock rpm intake will get you there. I think tempest is rated at flywheel, not sure about that.
JaniH is offline  
Old 10-11-2019, 02:44 PM
  #3  
Registered
 
Join Date: May 2012
Posts: 1,446
Likes: 0
Received 0 Likes on 0 Posts
Default

It was a cool motor but really nothing special other than the forged lower end.

The cam was around 214/224 @.44 valve lift. Much smaller than the lt4 hot cam. I would look at it like any other 350 you were going to build for performance. Solid bottom end, good heads, valvrtrain, induction, extaust, etc.
Mr Maine is offline  
Old 10-12-2019, 08:44 AM
  #4  
Registered
 
Join Date: Sep 2008
Location: Massachusetts
Posts: 338
Received 5 Likes on 3 Posts
Default

86 rating at the prop. Heads were the same as 260 so a better head would wake it up.

There is room for a better cam without reversion.
oconnor marine is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser